Toshiba MMW-UP0271LQ-E - Page 50

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Indoor unit (including Hot Water Module)
MG-CTT: Magnet contactor
L29 L29
There are insufficient number of P.C. board in
inverter box.
Trouble in number of
P.C. boards
L30 Detected indoor unit No. (L30)
Indoor external trouble
input (interlock)
Indoor unit has been shut down for external
trouble input in one refrigerant line (detected by
indoor unit).
–P03 P03
Outdoor discharge (TD1)
temperature trouble
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
P05 P05
00: Power detection trouble
01: Open phase
02: Power supply miswiring
Power detection trouble
/Open phase detection
/Power supply miswiring
detection
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
P07 P07
1 : Compressor 1 heat sink trouble
2 : Compressor 2 heat sink trouble
04: Heat sink dew condensation
Heat sink overheating
trouble
Heat sink dew
condensation trouble
Temperature sensor built into IPM (TH) detects
overheating.
Outdoor liquid temperature sensor (TL2) has
detected abnormally low temperature.
P10 Indoor unit No. detected (P10)
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
–P13 P13
Outdoor liquid backflow
detection trouble
State of refrigerant cycle circuit indicates liquid
backflow operation.
P15 P15
01: TS condition
Indoor unit overflow
Gas leak detection
02: TD condition
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
–P17
Outdoor discharge (TD2)
temperature trouble
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
4-way valve reversing
trouble
Abnormality in refrigerating cycle is detected
during heating operation.
–P20
Activation of high-pressure
protection
High pressure (Pd) sensor detects high pressure
that exceeds standard value.
Check code
Typical problem site Description of problem
Outdoor 7-segment display
Central
control or
main remote
controller
display
Sub-code
00
When there is much number of an inverter P.C.
board to model setting of an interface P.C. board.
The number of P.C.
board trouble
P19 Outdoor unit No. detected
P17
P04
Activation of high-pressure
SW
01: Compressor 1
02: Compressor 2
High-pressure SW is activated.
P04
–A01
Flow switch protective
operation
• Check the pump.
• Check the strainer.
• Check the flow switch.
(Type, directtion of attachment and point of contact)
A01
–A02
Water temperature
decrease trouble
• Check the water temperature.
• Check the heat insulator of wate pipes.
A02
–A04
Plate type heatexchanger
freezing protective operation
• Check the line heater.
• Check the PMV coil and PMV.
• Check the 2way valve coil and 2way valve.
A04
P20
P19
–P11 P11
Outdoor heat exchanger
freeze trouble
Remaining frost on outdoor heat exchanger
has been detected repeatedly.
Circle (O): Trouble P.C. board
P.C.board
Compressor Fan Motor
01
02
03
08
09
0A
0B
10
1
O
O
O
O
2
O
O
O
O
1
O
O
O
O
1
O
O
O
O
2
O
P.C.board
Compressor Fan Motor
11
12
13
18
19
1A
1B
1
O
O
O
O
2
O
O
O
O
2
O
O
O
O
O
O
O